Polarity

[Eileen Si 1G]

How do dipole moments determine polarity, like whether a covalent bond is polar or nonpolar?

[Amanda Lin 2I]

A molecule with a dipole moment is polar. A molecule with no dipole moment is nonpolar.

[Rebecca Epner 4A]

If a molecule is made up of two other same atoms, the molecule is nonpolar because the electronegativities are the same. Also, be sure to note that the bonds within a molecule may be polar even though the overall molecule is nonpolar.

[Frederick Keith_4C]

A dipole moment is the mathematical product of the separation of the ends of a dipole and the magnitude of the charges.
So a polar molecule will have a dipole moment with an arrow pointed towards the more electronegative atom. And a nonpolar molecule won't have a dipole moment.
Polar molecules must contain polar bonds due to a difference in electronegatvity between the bonded atoms.
Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself